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Journal Articles Journal of Computational and Applied Mathematics Year : 2022

Numerical and convergence analysis of the stochastic Lagrangian averaged Navier-Stokes equations

Abstract

The primary emphasis of this work is the development of a finite element based space-time discretization for solving the stochastic Lagrangian averaged Navier-Stokes (LANS-α) equations of incompressible fluid turbulence with multiplicative random forcing, under nonperiodic boundary conditions within a bounded polygonal (or polyhedral) domain of R^d , d ∈ {2, 3}. The convergence analysis of a fully discretized numerical scheme is investigated and split into two cases according to the spacial scale α, namely we first assume α to be controlled by the step size of the space discretization so that it vanishes when passing to the limit, then we provide an alternative study when α is fixed. A preparatory analysis of uniform estimates in both α and discretization parameters is carried out. Starting out from the stochastic LANS-α model, we achieve convergence toward the continuous strong solutions of the stochastic Navier-Stokes equations in 2D when α vanishes at the limit. Additionally, convergence toward the continuous strong solutions of the stochastic LANS-α model is accomplished if α is fixed.
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Dates and versions

hal-03406041 , version 1 (28-10-2021)
hal-03406041 , version 2 (29-05-2022)
hal-03406041 , version 3 (23-12-2022)

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Jad Doghman, Ludovic Goudenège. Numerical and convergence analysis of the stochastic Lagrangian averaged Navier-Stokes equations. Journal of Computational and Applied Mathematics, 2022, ⟨10.1016/j.cam.2022.114446⟩. ⟨hal-03406041v3⟩
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